#define  _CRT_SECURE_NO_WARNINGS 
#include <stdio.h>
#include <assert.h>
char* My_strcat(char* dest, const char* sour)
{
	assert(dest);
	assert(sour);
	char* temp = dest;
	while (*dest)
	{
		dest++;
	}
	while (*dest++ = *sour++)
		;
	return temp;
}
int main()
{
	char str1[30] = "have a good job ";
	char str2[] = "day day up";
	My_strcat(str1, str2);
	printf("%s", str1);
	return 0;
}
